Title:
SCALABLE ENCODER IMPROVING ENERGY COMPENSATION AND REVERSE COMPENSATION FUNCTION AND ITS METHOD
Document Type and Number:
Japanese Patent JP3241653
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To provide accurate picture extraction and compensation by performing energy compensation and energy inverse compensation, based on energy distribution of a high resolution picture, in the process of extracting a low resolution picture from a high resolution picture and compensating it.
SOLUTION: An energy compensator 22' calculates total energy TE about a video signal from an 8×8 block discrete cosine transformer and partial energy PE about a video signal of a 4×4 block which is in the upper left inside an 8×8 block, respectively. An energy ratio calculating part 22'b calculates the ratio of an energy ratio (√TE/PE), an energy square root calculating part 22'c calculates a square root, and a multiplier 22'd multiplies the square root of the energy root by weighted value (W) to find energy compensation value(ECV), offers it to an energy inverse compensator and compensates energy by multiplying a DCT(discrete cosine transformation) coefficient of a 4×4 block extractor by it. Thus, a drift effect is improved and an excellent picture quality is maintained.
Inventors:
Golden bell man
Shin Tai
Cui Tai good
Yoichi
Shin Tai
Cui Tai good
Yoichi
Application Number:
JP36111897A
Publication Date:
December 25, 2001
Filing Date:
December 26, 1997
Export Citation:
Assignee:
Samsung Electric Co., Ltd.
International Classes:
H04N19/12; G06T9/00; H03M7/30; H04N1/41; H04N7/24; H04N19/134; H04N19/176; H04N19/196; H04N19/33; H04N19/51; H04N19/59; H04N19/60; H04N19/625; H04N19/85; H04N19/91; (IPC1-7): H04N7/30; H04N1/41
Domestic Patent References:
| JP7222151A | ||||
| JP698308A | ||||
| JP62105577A |
Attorney, Agent or Firm:
Tadahiko Ito
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